Waste Bin Castor 740 Series heavy duty casters are heavier load bearing casters than most with a load capacity up to 1000kg. precision buit for durabilty under extreme conditions. the heavy duty welded series is ideal for an industrial environment. the swivel casters upper raceway 7/16" diameter ball bearing in a 4" forging & machining housing. lover raceway 6304 24s ball bearing in a precision fit. these casters rang provides extreme strength due to cold forming and fabrication, while the use of 10mm thick material provides an economical to our flagship. the heavy industrial rang. featuring a precision machined swivel ball race with seal that ensures the swivel movement is keep clean and smooth the high tensile steel kingpin helps to withstand high impact side loads. these heavy duty casters are suitable for most heavy duty applications including low speed. medium weight towing for custom design tyred models ( custom design tyred models casters can be successfully towed at 6kph on smooth floors without obstructions).. FEATURES Top Plate: 10mm thickness for long life Zerks: swivel and hub for easy lubrication. Sealed Swivel Section: keeps out debris King Bolt: king bolt and nut construction for added strength Finish Zinc plated for corrosion resistance Black finish available.